Buchanan dam is located in Llano county Texas with a geographic area of 7.7 square miles. The total population in Buchanan dam is 1,411 with 55.8% male and 44.2% female. Children under age 5 represent 4.6% of the population, under age 18 equal 11.5% of the population and over age 65 is 38.1% of the population. The median household income is $60,227, per capita income is $43,288. There are a total of 642 housing units with 74.9% owner occupied. Education includes 28.2% of residents that are high school graduates and 30.5% with a bachelor's degree or higher. The average temperature in Buchanan dam in the summer is 83 degrees, and in the winter 49 degrees.